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Official 9-DOF collaborative robotic arm system designed for the Unitree R1 humanoid robot platform. The R1-7a Professional I includes all features of the R1-7a Standard arm and comes equipped with the Dex2/5 Dexterous Hand. With 9 total degrees of freedom (7 arm joints + 2 dexterous hand DOF across 10 joints: 8 passive finger joints + 2 active thumb joints), ultra-lightweight 0.80 lb (365 g) hand, and no external cabling between dexterous hand and body, it provides a clean, compact, and highly reliable manipulation solution. Available in left-arm and right-arm mirror-image versions.
The Unitree R1-7a Professional I Robotic Arm is a compact 9-DOF manipulation system designed for the Unitree R1 humanoid robot platform. Building on the proven R1-7a Standard arm with its 7 degrees of freedom and 44.3 lb·ft (60 N·m) maximum joint torque, the Professional I variant adds the Dex2/5 Dexterous Hand as standard equipment, bringing the total system to 9 degrees of freedom (7 arm joints + 2 dexterous hand DOF distributed across 10 joints).
The arm features low-inertia high-speed inner-rotor PMSM bionic joint motors with high torque and high burst output, housed in a lightweight metal body with engineering plastic components. The integrated Dex2/5 dexterous hand features a minimalist architecture with 2 active DOF (thumb), 8 passive joints (four fingers), 2.25 lbf (10 N) fingertip force, and ultra-lightweight 0.80 lb (365 g) construction. A key differentiator is the no-external-cabling between dexterous hand and body design, delivering a clean, compact, and highly reliable integration. Each arm joint utilizes dual encoders for precise feedback. Supports flexible mounting (upright, side, inverted) and offers high-speed 485 communication for the arm.
7 arm joints plus 2 dexterous hand DOF (8 passive finger joints + 2 active thumb joints) deliver a compact, reliable manipulation solution. Dex2/5 hand included.
Minimalist five-finger hand with 2 active DOF, 10 joints (8 passive + 2 active), 0.80 lb (365 g) weight, 2.25 lbf (10 N) fingertip force, and 24-58V operation.
Clean, compact design with no external cables between dexterous hand and body. Eliminates cable wear, snagging, and maintenance issues for high reliability.
7 independent joints driven by low-inertia high-speed inner-rotor PMSM bionic joint motors. High burst output enables robust manipulation and dynamic humanoid tasks.
Each of the 7 arm motors is equipped with a dual encoder system for redundant, high-resolution position feedback and reliable closed-loop control.
High-speed 485 communication protocol for the arm. Robust, noise-resistant protocol suitable for humanoid robot integration and industrial environments.
The R1-7a Professional I comes equipped with the Dex2/5 Dexterous Hand, providing a minimalist, highly reliable manipulation solution:
The Dex2/5 dexterous hand features a no external cabling architecture between the hand and arm body, providing significant reliability advantages:
The Dex2/5 features a five-finger architecture with 2 active DOF (thumb) and 8 passive joints (four fingers) across 10 total joints, enabling adaptive grasping with minimal actuation complexity:
Two active joints provide opposable thumb motion for precision pinch grasps and power grasps. Primary actuated element of the hand.
Two passive joints per finger (index, middle, ring, pinky) enable adaptive conforming grasp. Fingers passively wrap around objects during thumb opposition.
Passive finger joints automatically conform to object shape during thumb closure, enabling versatile grasping of various object geometries with minimal control complexity.
Consistent 2.25 lbf (10 N) fingertip force enables secure grasping of lightweight to medium-weight objects while maintaining safe interaction.
Only 2 active DOF to control reduces computational complexity and simplifies integration with humanoid robot control systems.
10 joints distributed across five fingers (8 passive + 2 active) provide mechanical compliance and adaptive grasping capability.
The R1-7a Professional I is available in left-arm and right-arm versions, specifically designed for bimanual humanoid robot integration:
The R1-7a Professional I provides comprehensive real-time control and flexible integration options for humanoid robot applications:
High-speed 485 communication interface for the arm. Robust, noise-resistant protocol suitable for humanoid robot integration and industrial environments.
9 DOF (7 arm joints + 2 dexterous hand DOF across 10 joints). Simplified control architecture with 2 active hand DOF.
SDK and host computer control for seamless integration with humanoid robot control systems and research platforms.
Wide operating range of -4°F to 122°F (-20°C to 50°C). Ensures reliable performance in diverse environmental conditions.
Each R1-7a Professional I Robotic Arm package contains the following components:
| Arm | R1-7a Robotic Arm Unit | Complete 7-DOF robotic arm assembly with low-inertia high-speed inner-rotor PMSM motors, dual encoders, and industrial crossed-roller bearings. Specify left or right arm version. |
| Hand | Dex2/5 Dexterous Hand (x1) | Standard equipment -- Dex2/5 five-finger dexterous hand with 2 active DOF, 10 joints (8 passive + 2 active), 0.80 lb (365 g) weight, 2.25 lbf (10 N) fingertip force, no external cabling. |
| Accessory Kit | Power & Data Module Kit (x1) | Power and data module accessory kit for integration with humanoid robot systems. Power must be supplied by user via XT30 port. |
| Documentation | Development Documentation | Comprehensive development documentation, SDK reference, API documentation, and ecosystem support materials. |
| Product Name | R1-7a Professional I Robotic Arm |
| Product Series | Unitree R1 Humanoid Robot Arm |
| Arm Version | Left-arm or Right-arm (mirror images, default right-arm for single-arm applications) |
| Total Degrees of Freedom | 9 (7 arm joints + 2 dexterous hand DOF) |
| Arm Joint Motors | Low-inertia high-speed inner-rotor PMSM; bionic joint motor with high torque and high burst output |
| Max Joint Torque | 44.3 lb·ft (60 N·m) |
| Joint Feedback | Dual encoders |
| Hand Model | Dex2/5 Dexterous Hand |
| Hand DOF (Active) | 2 (thumb) |
| Hand Joints | 10 total (8 joints for four fingers [passive], 2 joints for thumb [active]) |
| Hand Dimensions | 5.94" x 2.64" x 2.76" (151 x 67 x 70 mm) |
| Hand Weight | 0.80 lb (365 g) |
| Hand Operating Voltage | 24-58V DC |
| Fingertip Force | 2.25 lbf (10 N) |
| Tactile Sensing | None |
| Wrist Camera | Not included |
| External Cabling (Hand-to-Body) | None -- clean, compact, highly reliable design |
| Arm Communication Protocol | High-speed 485 |
| Mounting Options | Upright, side, inverted |
| Supply Voltage | 24 V to 60 V DC |
| Power Consumption | Peak power 700 W; typical power ≤ 50 W |
| Operating Temperature | -4°F to 122°F (-20°C to 50°C) |
| Accessory Kit | Power & data module accessory kit x1 included |
| Warranty | 12-month warranty on the entire unit |
* Specifications are based on manufacturer data and may vary slightly by production batch.
* The R1-7a Professional I includes all features of the R1-7a Standard arm plus the Dex2/5 dexterous hand.
* Left/right arm versions available (mirror images). Default is right-arm SKU for single-arm applications.
* Dex2/5 hand features no tactile sensing and no wrist camera. External vision systems required for visual feedback.
* No external cabling between dexterous hand and body -- clean, compact, and highly reliable design.
* Power adapter NOT included. Power must be supplied by user via XT30 port (24V-60V). Peak power: 700W.
* Hand specifications: 2 active DOF (thumb), 10 total joints (8 passive + 2 active), 0.80 lb (365 g) weight, 2.25 lbf (10 N) fingertip force, 24-58V operating voltage.
* Secondary development requires advanced programming skills and familiarity with multi-DOF robotics control.
* Unitree is a registered trademark of Unitree Robotics.
Official 9-DOF collaborative robotic arm system designed for the Unitree R1 humanoid robot platform. The R1-7a Professional I includes all features of the R1-7a Standard arm and comes equipped with the Dex2/5 Dexterous Hand. With 9 total degrees of freedom (7 arm joints + 2 dexterous hand DOF across 10 joints: 8 passive finger joints + 2 active thumb joints), ultra-lightweight 0.80 lb (365 g) hand, and no external cabling between dexterous hand and body, it provides a clean, compact, and highly reliable manipulation solution. Available in left-arm and right-arm mirror-image versions.
The Unitree R1-7a Professional I Robotic Arm is a compact 9-DOF manipulation system designed for the Unitree R1 humanoid robot platform. Building on the proven R1-7a Standard arm with its 7 degrees of freedom and 44.3 lb·ft (60 N·m) maximum joint torque, the Professional I variant adds the Dex2/5 Dexterous Hand as standard equipment, bringing the total system to 9 degrees of freedom (7 arm joints + 2 dexterous hand DOF distributed across 10 joints).
The arm features low-inertia high-speed inner-rotor PMSM bionic joint motors with high torque and high burst output, housed in a lightweight metal body with engineering plastic components. The integrated Dex2/5 dexterous hand features a minimalist architecture with 2 active DOF (thumb), 8 passive joints (four fingers), 2.25 lbf (10 N) fingertip force, and ultra-lightweight 0.80 lb (365 g) construction. A key differentiator is the no-external-cabling between dexterous hand and body design, delivering a clean, compact, and highly reliable integration. Each arm joint utilizes dual encoders for precise feedback. Supports flexible mounting (upright, side, inverted) and offers high-speed 485 communication for the arm.
7 arm joints plus 2 dexterous hand DOF (8 passive finger joints + 2 active thumb joints) deliver a compact, reliable manipulation solution. Dex2/5 hand included.
Minimalist five-finger hand with 2 active DOF, 10 joints (8 passive + 2 active), 0.80 lb (365 g) weight, 2.25 lbf (10 N) fingertip force, and 24-58V operation.
Clean, compact design with no external cables between dexterous hand and body. Eliminates cable wear, snagging, and maintenance issues for high reliability.
7 independent joints driven by low-inertia high-speed inner-rotor PMSM bionic joint motors. High burst output enables robust manipulation and dynamic humanoid tasks.
Each of the 7 arm motors is equipped with a dual encoder system for redundant, high-resolution position feedback and reliable closed-loop control.
High-speed 485 communication protocol for the arm. Robust, noise-resistant protocol suitable for humanoid robot integration and industrial environments.
The R1-7a Professional I comes equipped with the Dex2/5 Dexterous Hand, providing a minimalist, highly reliable manipulation solution:
The Dex2/5 dexterous hand features a no external cabling architecture between the hand and arm body, providing significant reliability advantages:
The Dex2/5 features a five-finger architecture with 2 active DOF (thumb) and 8 passive joints (four fingers) across 10 total joints, enabling adaptive grasping with minimal actuation complexity:
Two active joints provide opposable thumb motion for precision pinch grasps and power grasps. Primary actuated element of the hand.
Two passive joints per finger (index, middle, ring, pinky) enable adaptive conforming grasp. Fingers passively wrap around objects during thumb opposition.
Passive finger joints automatically conform to object shape during thumb closure, enabling versatile grasping of various object geometries with minimal control complexity.
Consistent 2.25 lbf (10 N) fingertip force enables secure grasping of lightweight to medium-weight objects while maintaining safe interaction.
Only 2 active DOF to control reduces computational complexity and simplifies integration with humanoid robot control systems.
10 joints distributed across five fingers (8 passive + 2 active) provide mechanical compliance and adaptive grasping capability.
The R1-7a Professional I is available in left-arm and right-arm versions, specifically designed for bimanual humanoid robot integration:
The R1-7a Professional I provides comprehensive real-time control and flexible integration options for humanoid robot applications:
High-speed 485 communication interface for the arm. Robust, noise-resistant protocol suitable for humanoid robot integration and industrial environments.
9 DOF (7 arm joints + 2 dexterous hand DOF across 10 joints). Simplified control architecture with 2 active hand DOF.
SDK and host computer control for seamless integration with humanoid robot control systems and research platforms.
Wide operating range of -4°F to 122°F (-20°C to 50°C). Ensures reliable performance in diverse environmental conditions.
Each R1-7a Professional I Robotic Arm package contains the following components:
| Arm | R1-7a Robotic Arm Unit | Complete 7-DOF robotic arm assembly with low-inertia high-speed inner-rotor PMSM motors, dual encoders, and industrial crossed-roller bearings. Specify left or right arm version. |
| Hand | Dex2/5 Dexterous Hand (x1) | Standard equipment -- Dex2/5 five-finger dexterous hand with 2 active DOF, 10 joints (8 passive + 2 active), 0.80 lb (365 g) weight, 2.25 lbf (10 N) fingertip force, no external cabling. |
| Accessory Kit | Power & Data Module Kit (x1) | Power and data module accessory kit for integration with humanoid robot systems. Power must be supplied by user via XT30 port. |
| Documentation | Development Documentation | Comprehensive development documentation, SDK reference, API documentation, and ecosystem support materials. |
| Product Name | R1-7a Professional I Robotic Arm |
| Product Series | Unitree R1 Humanoid Robot Arm |
| Arm Version | Left-arm or Right-arm (mirror images, default right-arm for single-arm applications) |
| Total Degrees of Freedom | 9 (7 arm joints + 2 dexterous hand DOF) |
| Arm Joint Motors | Low-inertia high-speed inner-rotor PMSM; bionic joint motor with high torque and high burst output |
| Max Joint Torque | 44.3 lb·ft (60 N·m) |
| Joint Feedback | Dual encoders |
| Hand Model | Dex2/5 Dexterous Hand |
| Hand DOF (Active) | 2 (thumb) |
| Hand Joints | 10 total (8 joints for four fingers [passive], 2 joints for thumb [active]) |
| Hand Dimensions | 5.94" x 2.64" x 2.76" (151 x 67 x 70 mm) |
| Hand Weight | 0.80 lb (365 g) |
| Hand Operating Voltage | 24-58V DC |
| Fingertip Force | 2.25 lbf (10 N) |
| Tactile Sensing | None |
| Wrist Camera | Not included |
| External Cabling (Hand-to-Body) | None -- clean, compact, highly reliable design |
| Arm Communication Protocol | High-speed 485 |
| Mounting Options | Upright, side, inverted |
| Supply Voltage | 24 V to 60 V DC |
| Power Consumption | Peak power 700 W; typical power ≤ 50 W |
| Operating Temperature | -4°F to 122°F (-20°C to 50°C) |
| Accessory Kit | Power & data module accessory kit x1 included |
| Warranty | 12-month warranty on the entire unit |
* Specifications are based on manufacturer data and may vary slightly by production batch.
* The R1-7a Professional I includes all features of the R1-7a Standard arm plus the Dex2/5 dexterous hand.
* Left/right arm versions available (mirror images). Default is right-arm SKU for single-arm applications.
* Dex2/5 hand features no tactile sensing and no wrist camera. External vision systems required for visual feedback.
* No external cabling between dexterous hand and body -- clean, compact, and highly reliable design.
* Power adapter NOT included. Power must be supplied by user via XT30 port (24V-60V). Peak power: 700W.
* Hand specifications: 2 active DOF (thumb), 10 total joints (8 passive + 2 active), 0.80 lb (365 g) weight, 2.25 lbf (10 N) fingertip force, 24-58V operating voltage.
* Secondary development requires advanced programming skills and familiarity with multi-DOF robotics control.
* Unitree is a registered trademark of Unitree Robotics.
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